Does what it says; neatly. Thank-you PorDiBle! I don't know how else to create .pdb files, and this does it for free. It's also very lean, requiring very little RAM.
Don't forget: you have to drag your rtf document and drop it on the Pordible icon.
It says so right in the description of PorDiBle people; c'mon.
Admittedly, after it's done converting an .rtf document, the new .pdb version won't appear until you de-select the original .rtf document by clicking anywhere. This shouldn't take long for most folks to figure out, but it does seems a little weird, and maybe the Pordible folks should say so; but still overall, 5 stars.

Palm Reader Pro demo 2.4.2 reads all of these .pdb files smoothly for me. It does have a problem with certain fonts, so perhaps you should convert the rtf document to a more basic font before you convert it to .pdb.

David Pogue's OS X book (the big one for Jaguar) says that you should use the TextEdit, preference to (always?) save documents as rtf, and (maybe?) never as plain text (.txt) because it opens more powerful features in text edit and M$ Word reads them and can create them, simply by choosing 'save as rich text format'. I find this quite helpful. I barely use AppleWorks anymore, because it's Carbon not Cocoa, and none of the PeeCees I use have AppleWorks for Windows.
Apple's TextEdit is a splendid Cocoa (native OS X) application with total cross platform compatibility.

I'm having trouble with a new Sony Clie PEG-TJ25/U running Palm OS 5.2.1, MarkSpace's the MissingSync 3.0.9, Mac OS 10.2.8, and after about 10 hours of work, no sync-o', and no comprehendo, amigo.
Palm Sync executes and runs, but with no actual data transfer.
Please let me know if you have any ideas.